<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" class="left-scroll-view">
        <block v-for="(item,i) in cateList" :key ="i">
           <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧滑动区 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" class="right-scroll-view" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 二级分类的标题 -->
          <view class="vate-lv2-title" v-if="item2.children">
            /{{item2.cat_name}}/
          </view>
          <!-- 当前二级分类下的三级分类列表 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的item项目 -->
             <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
               <!-- 三级分类的图片 -->
               <image :src="item3.cat_icon" mode=""></image>
               <!-- 三级分类的文本 -->
               <text>{{item3.cat_name}}</text>
             </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
	mixins:[badgeMix],
    data() {
      return {
        //当前设备可用的高度
        wh:0,
        // 分类数据列表
        cateList:[],
        // 激活项
        active:0,
        // 二级分类列表
        cateLevel2:[],
		// 距离顶部距离
        scrollTop:0
      };
    },
    onLoad() {
      //获取设备可用高度
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight-50
      //调用方法，获取分类数据
      this.getCateList()
    },
    methods:{
      //获取分类列表数据
      async getCateList() {
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        console.log(res)
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        //解决切换分类bug
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      //跳转到商品列表
      gotoGoodsList(item) {
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
}
.left-scroll-view{
   width: 120px;
}
.left-scroll-view-item{
  background-color: #f7f7f7;
  line-height: 60px;
  font-size: 12px;
  text-align: center;
  &.active{
    position: relative;
    background-color: #ffffff;
    
    &::before{
      content: '';
      position: absolute;
      top: 50%;
      left: 0;
      transform: translateY(-50%);
      display: block;
      width: 3px;
      height: 30px;
      background-color: #f44e4e;
    }
  }
}
.right-scroll-view{
  background-color: #fff;
}
.vate-lv2-title{
   font-size: 12px;
   font-weight: bold;
   text-align: center;
   padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom:10px ;
    width: 33.33%;
    image{
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px;
    }
  }
}
</style>
